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케이블 사장교용 내고온 · 내고압 유압 펌프의 설계에 관한 연구
진진(Zhen Qin),우위팅(Yu-Ting Wu),김동선(Dong-Seon Kim),김상배(Sang-Bae Kim),류성기(Sung-Ki Lyu) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.11
Hydraulic pumps are widely used in fields such as machinery manufacturing, engineering and construction. Although the research on hydraulic engineering is mature, it is still necessary to examine various performance aspects in detail for specific applications. This paper will focus on the hydraulic pump used in special construction machinery that needs high temperature and high pressure resistance. It will analyze the theoretical design, structure and thermal characteristics of the pump system using the Fundamentals of Engineering (FE) method, and will measure the key tolerance parameters of the hydraulic pump to ensure the accuracy of the machining. Through this research, a good design method for the linear reciprocating type of hydraulic pump can be summarized.
유압 구동시스템용 체크 밸브의 유동특성 및 구조안정성에 관한 연구
우위팅(Yu-Ting Wu),진진(Zhen Qin),곽기명(Gimyeong Gwak),류성기(Sungki Lyu),조용민(Yongmin Cho),백승호(Seoungho Back),박상후(Sanghu Park) 대한기계학회 2021 大韓機械學會論文集A Vol.45 No.7
유압 구동시스템은 여러 산업기계에서 널리 사용되며 체크 밸브는 유압 동력전달시스템의 중요한 부품이다. 하지만 유로와 하우징의 부적절한 설계로 인하여 고압의 오일이 전달될 때 체크 밸브의 누유 및 손상과 같은 문제가 빈번하게 나타난다. 이러한 문제를 해결하기 위하여 본 연구에서는 유한체적법(FVM)과 유체 동역학 기반의 수치적 연구 수단을 활용하여 유압 기계에 사용하는 “L”자형 고압 체크밸브를 바탕으로 설계를 평가하였다. 또한 유한요소법(FEM)을 바탕으로 내부 고압을 고려하여 체크 밸브 하우징의 구조적 안정성에 대해 시뮬레이션을 진행하였다. 본 논문에서 사용한 연구방법은 다양한 유압시스템용 체크 밸브에 적용이 가능하며 유압 동력전달 과정의 안전성을 보장하기 위하여 중요한 설계 평가 사례를 보였다. Hydraulic drive systems are widely used in the equipment used in various industries, such as agriculture and construction. The internal check valve is an important part of the hydraulic power transmission system in a hydraulic machinery. Because of improper design of the flow circuit and housing, check valves are exposed to various problems, such as leakage and damage, frequently during high pressure transmission. To solve this problem, the L-shaped high-pressure check valve used in hydraulic machinery was designed and evaluated using the finite volume method and numerical research method based on fluid dynamics. Furthermore, considering the impact of high internal pressure on the check valve shell, the structural stability of the valve was simulated using the finite element method. The research method adopted in this study can be applied to check valves in various hydraulic systems. Additionally, an important design and evaluation example is provided to ensure the safety of the hydraulic power transmission process.
주이환(Yi-Hwan Joo),진진(Zhen Qin),문성민(Seongmin Moon),류성기(Sung-Ki Lyu) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.4
Induction bending via high-frequency heating is widely used for manufacturing pipe and section steel bends. It allows productivity improvement, unit cost reduction, delivery time compliance, and good mechanical properties. The recent increase in high-end vessels and offshore plants has raised the demand for high-frequency bending, which should improve the product quality and reduce the costs by simplifying the fabrication process; therefore, the characteristics and performance of this technique must be studied and proper design technology is required. During hot pipe bending via induction heating, the outward wall thickness of the pipe is thinned due to tensile stress and this thickness reduction cannot exceed 12.5%. This study focused on pipe bends with a bending curvature of 5D and their optimization design; in particular, the conditions that can both improve the productivity of the high-frequency bending process and keep the maximum thickness reduction below 12.5% were determined.
Study on Tooth Micro-geometry Optimization of Rear Gear Set in 2 Speed Planetary Gear Reducer
전민형,김래성,노승윤,진진,최창,류성기,Jeon, Min-Hyung,Kim, Lae-Sung,Noh, Seung-Yoon,Zhen, Qin,Choi, Chang,Lyu, Sung-Ki The Korean Society of Manufacturing Process Engine 2017 한국기계가공학회지 Vol.16 No.5
Gear tooth micro-geometry modifications include the intentional removal of material from the gear teeth flanks, so that the shape is no longer a perfect involute. If the gear shapes are perfect, then the gear tooth meshing is better, therefore the gears will transmit input torque in a more efficient manner without the generation of high frequency engine fluctuation noise. In this paper, we study tooth micro-geometry optimization of rear gear set in 2 speed planetary gear reducers. Analysis revealed problems which are need of modification. Based on the results, tooth micro-geometry was used to deal with load distributions on the rear gear set.
A Study on the Fabrication and Performance Evaluation of Worm Gear Reducer
Dong Gyu Lee(이동규),Qin Zhen(진진),Min Hyong Jeon(전민형),Lae Sung Kim(김래성),Sung-Ki Lyu(류성기) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.1
We aimed to develop a high quality 3.5 ton class swing reducer by studying the efficiency improvement of the reducer through the optimum design and performance evaluation of the assembled, high efficiency, lightweight 3.5 ton swing reducer. Based on the optimal design of the worm and worm wheel, the optimal manufacturing method of the worm wheel, the optimized casing design, and the optimum design of the output pinion, Respectively. Therefore, in this paper, to improve the efficiency of the worm gear reducer system, we will develop the manufacturing technology and verify the mass production by combining the manufacturing process design, processing and assembling technology according to the optimization design. We have conducted research to realize mass production by product verification such as product efficiency, reliability and durability according to optimal design of worm gear reducer.
마이크로 지오메트리 방법을 이용한 크로스 드릴링/밀링 유닛 구동기어의 동력전달 최적화에 관한 연구
김동선(Dong-Seon Kim),진진(Zhen Qin),백권인(Gwon-In Beak),우위팅(Yu-Ting Wu),전남술(Nam-Sul Jeon),류성기(Sung Ki Lyu) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.4
A cross drilling/milling Unit is an important mechanical part which is widely used in many kinds of machining tool, and various gear trains with good accuracy and reliability features are widely used in power transmission systems. A study on a novel power transmission optimization method for driving gear trains in cross drilling/milling units is presented in this paper. A commercial program for gear system simulation, Romax Designer, was used in this research to intuitively observe the gear meshing and the load distribution conditions on the gear teeth. We obtained the optimal modification value through comparing the results of repeated experiments. For validation, optimized gears were fabricated and then measured with a precision tester.
마이크로 치형수정이 선회가공 유닛 구동기어의 동력전달 특성에 미치는 영향에 관한 연구
장정환(Jeong-Hwan Jang),진진(Zhen Qin),김동선(Dong-Seon Kim),우위팅(Yu-Ting Wu),류성기(Sung Ki Lyu) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.6
Rotating machining unit is a revolutionary product that can process worm shaft or spiral shaft with fast and precise, a rotary type cutting tool, which is attached to automatic lathe and processes spiral groove on outer circumference of round bar. In this work, a study on micro tooth shape modification method of driving gear train in the rotating machining unit was presented. To observe the effect on power transmission characteristics of the driving gear pair, visualize the gear meshing condition and the load distribution on the gear teeth by using the professional gear train analysis program RomaxDesigner. By comparing the repeated analysis results, the effect of micro tooth shape modification on power transmission characteristics on driving gear can be summarized. The optimized gears were fabricated and measured by precision tester as a validation in this research.
17cc급 자동차용 압축기의 고체윤활 최적화 및 구조 설계에 관한 연구
양용군(Yong-Kun Yang),진진(Zhen Qin),최요한(Yeo-Han Choi),류성기(Sungki Lyu) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.12
Fuel economy has always been a major issue in the automobile industry, especially owing to the associated environmental concerns. It is widely known that only 5-20% of the energy generated by automobiles running on internal combustion engine engines is used as power, while the rest is consumed because of friction between components. The main components of the reciprocating piston type compressor used in vehicles, such as the shaft, swash plate, piston, and cylinder, cause severe energy loss owing to frictional contact between each other. The wear contact between the main shaft and the other components is particularly severe. Most quality issues arise owing to the sticking phenomenon that occurs between these parts. In this study, a coating solution to reduce friction is prepared by mixing adhesive solid lubricant, organic binder-polyadimide, inorganic binder (Binder), and graphite in four different ratios, and the best combination is determined.